I suggest you make them battle it out in tournaments.

Allowing them to only have the interface set on "general" view. As in not being able to see the battlefield apart from what the general can see.

One of the biggest problems most of my fellow students had when we started our studies was to remember that a general could never see anything but what we can see when walking down the street (or sitting on a horse!).

Think it would give them quite a different view on being a succesfull commander, especially if they battle it out on huge settings.